Electrical fuse-plug.



N. W. NUTT.

ELECTRICAL FUSE PLUG.

APPLICATION FILED JAN-24, 1914.

1.158445. Patented Oct. 26, 1915.

' Inventor: 267/}2d72 W121i? UNITED STATES PATENT OFFICE. 3

- NO RM AN W. NUTT, OF TRENTON, NEW JERSEY, ASSIGNOR TO TRENTON ELECTRICAND CONDUIT COMPANY, OF TRENTON, NEVI JERSEY, A CORPORATION OF NEWJERSEY.

ELECTRICAL FUSE-PLUG.

To all whom it may concern:

Be it known that I, NORMAN W. NUTT, a citizen of the United States ofAmerica, and residing at Trenton, in the county of Mercer and State ofNew Jersey, have invented certain new and useful Improvements inElectrical Fuse-Plugs, of which the following is a specification, suchas will enable those skilled in. the art to which it apoertains to makeand use the same.

1 his invention relates to fuses in electrical circuits, particularly toplugs carry ing such fuses and adapted for easy and instant installationor substitution, and the main object of this invention is to form a plugof two parts jointly forming .a chamber therein and means for readilyconnecting said parts together with the fuse therein.

A further object is to provide an element which is adapted to visiblyindicate the fact when the fuse has blown out.

Another object is to so form the constituent parts of my plug as to beinterlocking against movement of one part on another but which readilypermit taking the plug apart to replace a burned out fuse.

A further object is to embed the fuse in asbestos or the like to takethe flame and heat of a fuse when blown out; and other objects are toform such fuses of conventional exteriors for use in standard sockets,which are very simple in construction, fully efficient, andcomparatively inexpensive.

My invention is fully set forth in the following specification, of whichthe accompanying drawings form a part, in which the separate parts aredesignated by the same reference characters in each of the views, and inwhich Figure l is a plan view of a base provlded with two of my improvedfuse plugs; Fig. 2 is a section taken on the line 22 of Fig. 1; Figs. 3and 6 are side and bottom plan views of one of the members of my plug;Figs. 4 and Tare side and top plan views of another member; and Figs. 5and 8 side and bottom plan views of still another member which I employ.

In the drawings forming a part of this application I have shown apresent preferred method of accomplishing the desired results, embodyinga socket member or base (1 provided with conductor clamps b and c, theformer being connected with a plate 6 and center contact 6 which isinsulated Specification of Letters Patent.

Patented Oct. 26, 1915.

Application filed January 24, 1914. Serial No. 814,044.

from the plate 0 of the clamp c by means of a washer b, said plate 0"being connected directly with the metal socket and which 18 preferablyscrew-threaded internally, it being understood that the base a is formedof insulating material, such as porcelain or the like.

My plug consists of a main portion (I having a cavity therein andscrew-threaded eX- ternally, the inner end being slotted transversely asshown at 0?, Figs. 3 and 6, and the outer end has a small recess dconnnunieating with the interior of the part d by means of a smallpassage 03', a disk of paper or the like, (i being placed in the recess03 for a purpose hereinafter pointed out.

In connection with the part d I provide a part c which has two sideposts 6 adapted to enter the slot in the member 03 whereby said partsare locked against rotary movement, one on the other, the circularportion of the part 6, shown at 6 serving as a closure for the cavity inthe part d and forming a substantially air-tight chamber 6, andcentrally of the part e I provide a small opening through the portion 6In conjunction with the part 6 I provide a metal disk 7', adapted torest on the center contact 6 when the plug is in position, said disk fhaving pliable fingers 7, Fig. 2, passed through the opening in the partc and being bent therein to lock said disk to the part e, and the fuse fis soldered to this disk, the fuse and disk being preferably though notnecessarily provided in this joined form, as the connection with thepart 6 requires no skill and is instantly made.

\Vhen the parts (l and e have been joined in the manner stated, aninternally and externally screw-threaded sleeve is screwed on the part(Z to lock the members (Z and 6 against separation, this sleeve beingdesignated by the character IL, and I prefer to employ pliable fingers7L2 at the edge of the sleeve 11. which are adapted to be bent to enterrecesses 12, on the part (2, thus preventing accidental rotary movementof the sleeve when once in position, although it may be removed at willby merely straightening these fingers k In assembling my plug the fuseis first passed into the member 6 and the diskf secured in position asstated, the fuse being then laid over one of the posts 0 of the member6, after which the members (i and e are joined together, the asbestospacking having been previously placed in the member d, and the sleevehis then screwed over the members d and e and the fuse secured to thesaid sleeve in any desired manner, pref erably by soldering, and my plugis ready for use, it of course being understood that the members d and eare of insulating material, such as porcelain or the like, whereas thesleeve h is of conductive material.

The sleeve h adapts itself to the screwthread' of the member at and tothe screwthread of the socket c and a circuit is thereby established,from the clamps or binding posts I) and 0, through the center contact 6disk f, fuse, sleeve it and outer contact 0 and, in the event of thefuse blowing out, the fact is indicated by the burning or darkening ofthe paper disk d or, perhaps, by its forcible removal from its normalseat by the explosion of the fuse; in such event the damaged plug may bequickly removed and another plug substituted therefor, repair of thedamaged plug awaiting the pleasure or opportunity of the electrican orengineer.

My invention is very compact, simple to manufacture, instantaneous insubstitution, easy of repair by the insertion of a new fuse, the membersare all looked together against movement, and the device is veryinexpensive and, while I have shown certain specific details of the plugand of the socket base, it will be obvious that I do not limit myselfthereto as various changes in and modifications of the same may be madewithout dcparting from the spirit of my invention or sacrificing itsadvantages.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A fuse plug composed of two members joined together to form a chambertherein, one of said members havinga transverse slot and the othermember having a post projected into said slot to prevent rotary movementof saidmembers on each other, a sleeve threaded on said members toprevent longitudinal separation thereof, a contact disk at the bottom ofsaid plug, and a fuse joining said disk and said sleeve, said post andsaid slotted member having registering grooves jointly forming a passagefor said fuse to reach said sleeve.

In testimony that I claim the foregoing as my invention I have signed myname in presence of the subscribing witnesses this 22nd day of January,1Q14.

NORMAN W. NUTT.

Witnesses:

KATHARINE L. NYMAN, CLIFFORD J. ALPAUGH.

